Resilient Sealing Sleeve

Abstract

When, according to the invention, a sealing sleeve is made of HNBR polymer and is provided with a bushing (3) which extends around the outwardly extending shaft (1), and also with an end portion (6) which may be bellows-shaped and finally an outer ring (7) which can engage the exterior of the shaft housing (6), a solid and tight sleeve is achieved.

Description

STATE OF THE ART[0001]The invention relates to a resilient sleeve preferably for sealing around shafts, rods and similar connecting means, said sleeve extending around the shaft and being secured around the shaft and optionally also around the exterior of the housing or shield extending around the shaft.[0002]Such sealing sleeves are known in numerous embodiments. Because of the increased requirements with respect to such products, particularly in the automobile industry, everything technically possible has been done to configure the sleeves to meet the requirements.[0003]In particular, the sleeves must be capable of withstanding the mechanical impacts to which they are subjected in operation, which especially involves vibrations and the ability to absorb movements. In addition, the sleeves must be capable of accommodating angular movements, where universal joints and the like are involved.[0004]In this connection, previously known rubber sleeves have the drawback that ageing especi...

AI Technical Summary

Benefits of technology

[0011]An effective seal is achieved in this simple manner in the mounting of the sleeve around the parts at the location for the mounting, as the ribs, the waves at the engagement face will ensure a completely tight joint through which lubricants cannot escape, and where liquids cannot penetrate from the outside, just as the wear resistance is great.

[0012]When, as stated in claim 2, the ribs, the waves are arranged near the inner end of the bushing, a great wear resistance as well as sealing degree will be achieved.

[0013]When, as stated in claim 3, the sleeves are made of a piece of HNBR polymer, the ability of the sleeve to maintain the elasticity and its resistance to aggressive agents, such as lubricants, salts and like, as well as a high degree of gas tightness are ensured.

Problems solved by technology

In this connection, previously known rubber sleeves have the drawback that ageing especially causes the elasticity of the rubber to deteriorate, just as cracks and fissures easily occur.

US 2002 / 132674 A discloses an example of a sleeve made of polyurethane foam which, however, cannot satisfy the wear resistance and sealing requirements of today.

The reason is the material which is not sufficiently gas-tight and wear resistant.

To this should be added that the seal around the shaft is not very reliable owing to the completely smooth engagement face.

No particularly high degree of sealing is involved, however, since the sealing part is so relatively small that the sealing degree around the shaft will be very limited.

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